Ashcroft ST-2A Specifications

Type ST-2A Digital Indicator

FEATURES

• Measurement of pressure, tempera­ture, voltage and current

• Accuracy ratings of ±0.1, 0.05% and

0.025% F.S. (pressure)

• Pressure ranges from 0.25 inches of
water to 10,000 psi

• Interchangeable pressure and temper-

ature modules

• Multiple engineering units

• Temperature measurement with most
common RTDs and thermocouples

• Programmable damping

• Tare capability

• Display hold

• RS232 two-way communications

• Standard N.I.S.T.-traceable certificate
of calibration

The ST-2A is the perfect bench compan-

ion product to the Ashcroft

®

ATE-100 field
handheld calibrator. This bench top (or
panel mounting) package shares the
same pressure and temperature modules
and interfaces with the same software
packages as the Ashcroft ATE-100. An
intuitive menu- driven user interface puts
all of the ST-2A’s power at the simple
press of a key. It uses the AQS (Ashcroft
Quick-Select™) modular sensor system
to provide the ultimate in measurement
flexibility.

Now you can purchase a calibration
system to serve your field and bench
mounting requirements while enjoying the
significant cost savings gained through
the availability of common pressure mod­ules and software.

SPECIFICATIONS

Standard Display: Alphanumeric LCD, 0.37-inch

height, 2 lines, 16 characters/line

Optional Display: Backlit LCD alphanumeric with 2

lines and 16 characters/line

Display Resolution: ±0.002% of span, 60,000

counts (max)

Display Update Rate: 130ms (nominal) with one

sensor installed

Engineering Units: psi, in.H

mbar, kPa, MPa, mmHg, cmH2O, mmH

2

kgcm

and any single user-programmable

engineering unit

Damping: Programmable averaging from zero

through 16 consecutive readings

Standard Operating Range: 32° to 120°F (0 to

49°C)

Compensated Range: 20° to 120°F (–7° to +49°C)
Reference Temperature: 70 ±3°F
Standard Temperature Effect: ±0.004% of span per

degree Fahrenheit over the compensated range

Optional: AQS-2 Quick-Select modules are available

calibrated to maintain rated accuracy over the
20° to 120°F (–7° to +49°C) compensated
temperature range.

Storage Limits: –4°F to +158°F (–20° to +70°C)
Electrical Sourcing Specification: 24 Vdc at 25mA
Electrical Measurement Specification:

Input (volts)
0/10 Vdc ±0.025% F.S.
0/30 Vdc ±0.10% F.S.
Input (mA)
0/20mA ±0.03% F.S

Temperature Effects Electrical Measurement:

±0.001% of span per °F over the compensated
range

Weight: ST-2A Base unit: 3.0 lb (1.4 kg)
Housing: Molded, high-impact ABS case
Electrical Connections: Standard banana jacks
Optional Battery Power Supply: 5 “AA” nicads with

built-in charger or 5 “AA” alkaline (non­rechargeable)

External Power Supply: AC adaptor 9 Vdc, 500mA
Portable Operation: 20 hours with optional back-

light off, 2 hours with backlight on

Warm-up: 5 minutes for rated accuracy (max-

imum), 30 minutes for complete stability

RS232 Serial Interface: with 9-pin D type at 300,

1200, 2400, 9600 baud.

Field Calibration: Calibration module and proper

pressure and electrical standards are required.

Optional Data Logging Capacity:

Standard measurements:
Date/time stamped measurements:
Provides prompts for storage of calibration
history information, including instrument tags,
As Found/As Left data and corresponding
ambient temperature

O, in.Hg, ftSW, bar,

2

Accuracy

Accuracy

714 records

O and

2

384 records

BULLETIN ST-2A

All specifications are subje ct to change without notice.
All sales subject to standard terms and conditions.
© Ashcro ft Inc. 2008 11/08

Ashcroft Inc., 250 Eas t Main Street, Stratfo rd, CT 06614 USA
Tel: [phone] • Fax: [phone]
email: info@ ashc roft .com • www.ashcroft.com

0.93

0.97

1.44

3.47

4.00

9.24

0.56

6.74

6.33

3.31

1.511.25

1.10

Type ST-2A Digital Indicator

STANDARD RANGES

AQS-2 AQS-1

psi ˝H2O

(gauge & (gauge/ Other Engineering Units**

absolute differential

pressure) pressure)

100
150
200
250
300
500

600
1000
1500
2000
2500
3000
5000
6000
7500

10,000

vacuum

compound

±10

±15

–15/+30
–15/+60

* Non-isolated, for clean dry gas only

5

0.25*

10

0.5*

15

1.0*

20

2.0*

25

3.0*

30

5.0*

50

10*

60

15*
25*

50*
100*
150*
200*

**Note: Engineering units

psi

in. H2O

in. Hg

ftSW

Bar

mBar

kPa

mPa
mmHg
cmH2O

mmH2O

2

kg/cm

User Selectable

identified above are
accessible through the
unit select feature. How­ever, readout will default
to the primary unit of
measure on start-up.
Sensor modules scaled in
primary units other than

O (AQS-1) or psi

in. H

2

(AQS-2) are also available.
Consult factory.

5
10
15

±0.125*

±5

±0.25*
±0.5*
±1.0*
±1.5*
±2.5*
±5.0*

±7.5*
±12.5*
±25*
±50*
±75*

±100*

BULLETIN ST-2A

All specifications are subje ct to change without notice.
All sales subject to standard terms and conditions.
© Ashcroft Inc. 2008 11/08

Ashcroft Inc., 250 Eas t Main Street, Stratfo rd, CT 06614 USA
Tel: [phone] • Fax: [phone]
email: info@ ashc roft .com • www.ashc roft .com